310 常時微動測定に基づく鉄骨造高層建物の振動モードに関する研究

概要

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This paper presents the evaluation of the vibration modes for a high-rise steel building based on the vibration measurement. The time history waves were transformed into the fourier spectra. It was able to evaluate the natural frequencies, the shapes of modes and the damping ratios using those fourier spectra. The frequency for the peak of the fourier spectrum is defined as the natural frequency. The shape of mode is evaluated based on the amplitude of the fourier spectrum for the three or five floors measuring at the same time. The damping ratio is evaluated with the half power method. The amplitude of the fourier spectra varied in each measurement. However, the natural frequencies and the shapes of modes did not vary. The damping ratio of the first mode was larger than the second and third modes at the longitudinal direction of the plan.
社団法人日本機械学会の論文
2000-09-01